A simple Python solution

  • 0
    class Solution(object):
        def diameterOfBinaryTree(self, root):
            self.s = 0
            return self.s
        def dfs(self, root):
            if not root: return 0
            l = self.dfs(root.left)
            r = self.dfs(root.right)
            self.s = max(self.s, l + r)
            return max(l, r) + 1

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